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Gillian Anderson has been hit with cruel jibes from Twitter users after she made an incredible return to The X Files - with some viewers claiming she has had plastic surgery.

The actress reprised her famous role as FBI agent Dana Scully in the hit sci-fi show, which is now back after nearly 15 years.

But while many heaped praise on the 47-year-old star, some viewers took to Twitter as the first episode aired on Monday night and appeared to mock her appearance.

It comes three years after she told a reporter she had considered plastic surgery and that "you can always tell when something's been done".

Gillian Anderson is back in style (Photo: FOX)

One user tweeted: "Unfortunately, the creepiest thing about the new £XFiles is Gillian Anderson's expressionless, Botox-filled face."

A fellow viewer added: "Loving the return of £XFiles even if Scully physically can't move her face, is she happy, sad, sceptical, nostalgic?! Who knows."

Another Twitter user said: "The aliens clearly implanted a LOT of Botox in Scully's face..."

And one wrote: "Gillian Anderson's face does not move, that's an impressive amount of surgery," while another added: "That is a ridiculous amount of Botox Scully".

In 2013, the star spoke to The Telegraph about being an actress in her 40s, saying: "Plastic surgery does cross my mind. I remember a couple of years ago looking in the mirror when I was putting on make-up for a play, I noticed some changes.

"I was so shocked that for a few seconds I convinced myself I'd eaten something I was allergic to." Anderson continued: "There was a period of time thinking, 'Surely something can be done without having to be cut into?' Then eventually you think, 'Oh, there's not'."

Scully's upped her style game for the new series (Photo: Fox and Rex)

She added: "But I'm very aware the women I admire in the public eye don't do anything.

"Judi Dench, her beautiful face, and Charlotte Rampling, there are so many women who have allowed themselves to get old naturally, and the fact is you can always tell when something's been done.

"I'd like to get to the point where I would look in the mirror and not feel bad but celebrate the natural process, rather than give the impression that something's wrong."

Gillian Anderson as Dana Scully and David Duchovny as Fox Mulder

However many viewers showered the star with praise, gushing over how "hot" she looked.

One fan tweeted: "Gillian Anderson is still hot as Dana Skully in x-files 20 years later #Xfiles"